It sounds like you have no backup of your data. Raid is not a replacement for having backups. Its intention is to keep your server 'up' should you experience drive failure.
With that out of the way, grab a sas card. They can run sata drives just fine. I would recommend a used M1015 for around $100. it runs raid 10's great and if you want to try unraid you can flash it to IT mode for use as a non-raid controller. It supports sata3 large drives and ssd's, and can directly attach 8 drives with up to 24 via sas expanders.
unraid is good solution and many people use these cards with it.